[TREX]

It seems like everyone participating in the thread have a good scope of the basis core ideas we need to consider to move forward with some really fun and interesting terrain.

Edit: as a general rule of thumb, we could limit the terrain pieces to a condition, and an effect to keep them to a level of simplicity.

Arcane Portal for example:
Condition-figures adjacent to an arcane portal may use one space of movement.
Effect- to place their figure on an empty space adjacent to another Arcane portal on the battlefield.

Simple enough, but effectively makes a whole lot of fun new possibilities for map makers.